:root {
  --color-primary: #e94560;
  --color-primary-dark: #c23152;
  --color-accent: #f5a623;
  --color-bg: #f7f8fc;
  --color-bg-alt: #ffffff;
  --color-text: #1a1a2e;
  --color-text-soft: #4a4a68;
  --color-text-muted: #7a7a96;
  --color-border: rgba(26, 26, 46, 0.08);
  --color-card: #ffffff;
  --color-glass: rgba(255, 255, 255, 0.6);
  --color-glass-border: rgba(255, 255, 255, 0.35);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 28px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 18px 48px rgba(26, 26, 46, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --max-width: 1180px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #ff5c7a;
    --color-primary-dark: #e94560;
    --color-accent: #ffc857;
    --color-bg: #0f0f1a;
    --color-bg-alt: #171729;
    --color-text: #f2f2f8;
    --color-text-soft: #c8c8dc;
    --color-text-muted: #9292ae;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-card: #1b1b30;
    --color-glass: rgba(30, 30, 52, 0.55);
    --color-glass-border: rgba(255, 255, 255, 0.12);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.6);
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(
      circle at 12% 8%,
      rgba(233, 69, 96, 0.08),
      transparent 42%
    ),
    radial-gradient(circle at 88% 22%, rgba(245, 166, 35, 0.07), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(99, 102, 241, 0.06), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.8rem);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
}

h3 {
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

p {
  margin: 0 0 1em;
  color: var(--color-text-soft);
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.4em;
  color: var(--color-text-soft);
}

::selection {
  background: var(--color-primary);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============ Header / Nav ============ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--color-glass-border);
  box-shadow: var(--shadow-sm);
}

header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.7rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
}

header nav > a {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-text);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  transition: transform var(--transition), filter var(--transition);
}

header nav > a:hover {
  transform: scale(1.04);
  filter: brightness(1.1);
}

header nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.35rem;
  flex: 1;
}

header nav ul li {
  margin: 0;
}

header nav ul a {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-soft);
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

header nav ul a:hover {
  color: var(--color-primary);
  background: rgba(233, 69, 96, 0.1);
  transform: translateY(-2px);
}

/* ============ Main layout ============ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

main > section {
  margin: 2.5rem 0;
  padding: 2rem clamp(1.25rem, 3vw, 2.5rem);
  background: var(--color-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  animation: fadeUp 0.7s ease both;
}

main > section:hover {
  box-shadow: var(--shadow-md);
}

main > section > h2 {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 1.4rem;
}

main > section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

/* Hero */
#hero {
  position: relative;
  overflow: hidden;
  margin-top: 2rem;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 4vw, 3rem);
  color: #fff;
  background: linear-gradient(135deg, #1a1a2e 0%, #3d1f4d 45%, #e94560 100%);
  border: none;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  inset: -50% -20% auto auto;
  width: 60%;
  height: 200%;
  background: radial-gradient(
    circle,
    rgba(245, 166, 35, 0.35),
    transparent 60%
  );
  filter: blur(40px);
  pointer-events: none;
  animation: floatGlow 12s ease-in-out infinite alternate;
}

#hero::after {
  content: "";
  position: absolute;
  inset: auto auto -40% -15%;
  width: 55%;
  height: 160%;
  background: radial-gradient(
    circle,
    rgba(99, 102, 241, 0.4),
    transparent 60%
  );
  filter: blur(50px);
  pointer-events: none;
  animation: floatGlow 14s ease-in-out infinite alternate-reverse;
}

#hero h1,
#hero p {
  position: relative;
  z-index: 1;
  color: #fff;
}

#hero h1 {
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

#hero p {
  max-width: 62ch;
  color: rgba(255, 255, 255, 0.86);
}

#hero > a {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin: 0.5rem 0.75rem 0.5rem 0;
  padding: 0.7rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition), background var(--transition),
    box-shadow var(--transition);
}

#hero > a:first-of-type {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-color: transparent;
  box-shadow: 0 8px 24px rgba(233, 69, 96, 0.45);
}

#hero > a:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  color: #fff;
}

/* Anchor nav */
main > nav[aria-label="页面锚点导航"] {
  padding: 1.25rem clamp(1.25rem, 3vw, 2.5rem);
  background: var(--color-glass);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s ease both;
}

main > nav[aria-label="页面锚点导航"] h2 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

main > nav[aria-label="页面锚点导航"] ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

main > nav[aria-label="页面锚点导航"] li {
  margin: 0;
}

main > nav[aria-label="页面锚点导航"] a {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-soft);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  transition: transform var(--transition), color var(--transition),
    background var(--transition), border-color var(--transition);
}

main > nav[aria-label="页面锚点导航"] a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-color: transparent;
  transform: translateY(-2px);
}

/* ============ Articles / cards ============ */
main article {
  padding: 1.25rem 1.4rem;
  margin-bottom: 1rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

main article:last-child {
  margin-bottom: 0;
}

main article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.3);
}

main article h3 {
  color: var(--color-text);
}

main article h3 + p {
  margin-top: 0.25rem;
}

main article p:last-child {
  margin-bottom: 0;
}

main article a {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), transform var(--transition);
}

main article a:hover {
  border-color: var(--color-primary);
  transform: translateX(3px);
}

/* Section-specific accents */
#news article {
  border-left: 4px solid var(--color-primary);
  background: linear-gradient(
    135deg,
    var(--color-bg-alt),
    rgba(233, 69, 96, 0.04)
  );
}

#articles article {
  border-left: 4px solid var(--color-accent);
}

#reviews article {
  border-left: 4px solid #6366f1;
  font-style: italic;
}

#faq article {
  border-left: 4px solid var(--color-primary);
}

#faq article h3 {
  cursor: default;
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  position: relative;
  padding-left: 2.6rem;
  margin-bottom: 0.9rem;
  color: var(--color-text-soft);
}

#howto ol li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.1em;
  width: 1.8rem;
  height: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

#contact article p {
  margin-bottom: 0.4rem;
}

#contact article p:first-child {
  font-weight: 600;
  color: var(--color-text);
}

#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.5rem;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), color var(--transition),
    background var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  transform: translateY(-2px);
}

/* ============ Footer ============ */
footer {
  margin-top: 2rem;
  padding: 2.5rem 1.25rem 2rem;
  background: linear-gradient(180deg, transparent, rgba(26, 26, 46, 0.05));
  border-top: 1px solid var(--color-border);
}

footer > section {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  padding: 1.1rem 1.4rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

footer > section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

footer h2 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

footer p {
  font-size: 0.88rem;
  margin: 0.2rem 0;
  color: var(--color-text-muted);
}

footer > section:last-child {
  text-align: center;
  background: linear-gradient(135deg, #1a1a2e, #3d1f4d);
  border: none;
}

footer > section:last-child p {
  color: rgba(255, 255, 255, 0.75);
}

footer > section:last-child h2 {
  color: #fff;
}

/* ============ Animations ============ */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatGlow {
  from {
    transform: translate(0, 0) scale(1);
  }
  to {
    transform: translate(-6%, 8%) scale(1.15);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  header nav {
    padding: 0.6rem 1rem;
    gap: 0.4rem 1rem;
  }

  header nav ul {
    gap: 0.15rem;
  }

  header nav ul a {
    font-size: 0.82rem;
    padding: 0.3rem 0.55rem;
  }

  main {
    padding: 0 1rem 2.5rem;
  }

  main > section {
    margin: 1.75rem 0;
    padding: 1.5rem 1.15rem;
    border-radius: var(--radius-md);
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
  }

  header nav {
    flex-direction: column;
    align-items: flex-start;
  }

  header nav ul {
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.2rem;
    scrollbar-width: none;
  }

  header nav ul::-webkit-scrollbar {
    display: none;
  }

  header nav ul a {
    white-space: nowrap;
  }

  #hero {
    padding: 1.75rem 1.15rem;
  }

  #hero > a {
    display: block;
    text-align: center;
    margin: 0.6rem 0;
  }

  main > nav[aria-label="页面锚点导航"] {
    padding: 1rem;
  }

  main article {
    padding: 1rem 1.1rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }

  footer {
    padding: 1.75rem 1rem 1.5rem;
  }
}

@media (min-width: 1200px) {
  main > section {
    margin: 3rem 0;
  }
}